preflooding

例句：

1. 1. The city was hit by a preflood warning before the floods arrived.
   在洪水到来之前，城市受到了一个预洪水警告。
2. 2. The scientists were studying the preflood patterns in the region.
   科学家们正在研究该地区的预洪水模式。
3. 3.The government has been working on a plan to prevent prefloods and mitigate their impact.
   政府一直在努力制定计划，以防止洪水并减轻其影响。